[Elecraft] K3S Power Issue

Mon Mar 27 17:17:24 EDT 2017

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  Thank you very much for your prompt response Don.  
  I have conducted a couple of additional tests and with an external power meter, even though the K3S indicates a power output of 75-80W, my external meter shows a power output of 100W.  
  I will tighten all of the connections and my try some other cables as I only have the equipment connected on my desktop in the interim.  
  Thanks again for your assistance. 
  73 
  Serge 
  VA3SB 

   ---------- Original Message ----------
   From: "Don Wilhelm [via Elecraft]" <ml-node+s365791n7628553h95 at n2.nabble.com>
   Date: March 27, 2017 at 4:57 PM

    Serge, 

   The first thing to do with a power output anomaly is to connect a dummy 
   load good for at least 100 watts and 50 ohms non-reactive to the K3 and 
   run the TX Gain Calibration from K3 Utility. 

   The next thing to do is to check all connectors to make sure they are 
   tight.  With PL-259s, 'finger-tight' may not be tight enough to insure 
   good contact for the shield connection - use pliers and give them that 
   LITTLE bit of extra tightness - don't overdo it. 

   I certainly cannot guess at what might have changed, but TX Gain 
   Calibration is a good place to start. 

   After that, since your antennas have a low SWR, you might try it with 
   the KAT500 in bypass. 

   On 3/27/2017 4:27 PM, Serge_VA3SB wrote:

    > Hello to the group. I am a new user of the K3S/KAT500 combo. 
    > Had fun using the rig during the contest over the weekend. I had it set for 
    > 100 watts and it worked very well. 
    > However, today I thought that i would place the KAT500 underneath the K3S. 
    > So after moving the KAT under the K3S I reconnected the cables and power to 
    > both units. 
    > 
    > No changes were made to any of the antennas and my swr on all antennas 
    > 80-10M is approx 1.1/1.2 - 1. 
    > I cannot seem to be able to get the output power to 100 W.
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